Stereoselective synthesis of the 6,7,6- and 6,7,7-ring systems of polycyclic ethers by 6-endo cyclization and ring expansion
作者:Yuji Mori、Keisuke Yaegashi、Hiroshi Furukawa
DOI:10.1016/s0040-4020(97)00816-8
日期:1997.9
A newstrategy for the stereoselective synthesis of the trans-fused seven-membered cyclic ethers corresponding to subunits of brevetoxin B and hemibrevetoxin B has been developed. The strategy involves alkylation of an oxiranylanion and 6-endocyclization followed by one-carbon homologation of a tetrahydropyran to an oxepane using trimethylsilyldiazomethane.